src/connectivity/bluetooth/profiles/bt-a2dp/config/source_only.json5

{
    domain: "Bluetooth",
    source_type: "audio_out",
    channel_mode: "basic",

    // Disable the audio sink.
    enable_sink: false,
    enable_avrcp_target: true,
    enable_aac: true,
    initiator_delay: 500,
}